Ding, Jingtao, Yujun Shen, Yanru Ma, Haibo Meng, Hongsheng Cheng, Xi Zhang, Jian Wang, and Pengyue Zhang. 2020. “Study on Dynamic Sorption Characteristics of Modified Biochars for Ammonium in Biogas Slurry”. International Journal of Agricultural and Biological Engineering 13 (1):234-40. https://ijabe.migration.pkpps06.publicknowledgeproject.org/index.php/ijabe/article/view/4697.